#!/bin/sh
. /lib/functions.sh
. /lib/functions/system.sh

# initialize defaults
RAMFS_COPY_BIN=""	# extra programs for temporary ramfs root
RAMFS_COPY_DATA=""	# extra data files
export MTD_CONFIG_ARGS=""
export INTERACTIVE=0
export VERBOSE=1
export SAVE_CONFIG=1
export SAVE_OVERLAY=0
export SAVE_PARTITIONS=1
export DELAY=
export CONF_IMAGE=
export CONF_BACKUP_LIST=0
export CONF_BACKUP=
export CONF_RESTORE=
export NEED_IMAGE=
export HELP=0
export FORCE=0
export TEST=0

# parse options
while [ -n "$1" ]; do
	case "$1" in
		-i) export INTERACTIVE=1;;
		-d) export DELAY="$2"; shift;;
		-v) export VERBOSE="$(($VERBOSE + 1))";;
		-q) export VERBOSE="$(($VERBOSE - 1))";;
		-n) export SAVE_CONFIG=0;;
		-c) export SAVE_OVERLAY=1;;
		-p) export SAVE_PARTITIONS=0;;
		-b|--create-backup) export CONF_BACKUP="$2" NEED_IMAGE=1; shift;;
		-r|--restore-backup) export CONF_RESTORE="$2" NEED_IMAGE=1; shift;;
		-l|--list-backup) export CONF_BACKUP_LIST=1; break;;
		-f) export CONF_IMAGE="$2"; shift;;
		-F|--force) export FORCE=1;;
		-T|--test) export TEST=1;;
		-h|--help) export HELP=1; break;;
		-*)
			echo "Invalid option: $1"
			exit 1
		;;
		*) break;;
	esac
	shift;
done

export CONFFILES=/tmp/sysupgrade.conffiles
export CONF_TAR=/tmp/sysupgrade.tgz

export ARGV="$*"
export ARGC="$#"

[ -z "$ARGV" -a -z "$NEED_IMAGE" -o $HELP -gt 0 ] && {
	cat <<EOF
Usage: $0 [<upgrade-option>...] <image file or URL>
       $0 [-q] [-i] <backup-command> <file>

upgrade-option:
	-d <delay>   add a delay before rebooting
	-f <config>  restore configuration from .tar.gz (file or url)
	-i           interactive mode
	-c           attempt to preserve all changed files in /etc/
	-n           do not save configuration over reflash
	-p           do not attempt to restore the partition table after flash.
	-T | --test
	             Verify image and config .tar.gz but do not actually flash.
	-F | --force
	             Flash image even if image checks fail, this is dangerous!
	-q           less verbose
	-v           more verbose
	-h | --help  display this help

backup-command:
	-b | --create-backup <file>
	             create .tar.gz of files specified in sysupgrade.conf
	             then exit. Does not flash an image. If file is '-',
	             i.e. stdout, verbosity is set to 0 (i.e. quiet).
	-r | --restore-backup <file>
	             restore a .tar.gz created with sysupgrade -b
	             then exit. Does not flash an image. If file is '-',
	             the archive is read from stdin.
	-l | --list-backup
	             list the files that would be backed up when calling
	             sysupgrade -b. Does not create a backup file.

EOF
	exit 1
}

[ -n "$ARGV" -a -n "$NEED_IMAGE" ] && {
	cat <<-EOF
		-b|--create-backup and -r|--restore-backup do not perform a firmware upgrade.
		Do not specify both -b|-r and a firmware image.
	EOF
	exit 1
}

# prevent messages from clobbering the tarball when using stdout
[ "$CONF_BACKUP" = "-" ] && export VERBOSE=0


list_conffiles() {
	awk '
		BEGIN { conffiles = 0 }
		/^Conffiles:/ { conffiles = 1; next }
		!/^ / { conffiles = 0; next }
		conffiles == 1 { print }
	' /usr/lib/opkg/status
}

list_changed_conffiles() {
	# Cannot handle spaces in filenames - but opkg cannot either...
	list_conffiles | while read file csum; do
		[ -r "$file" ] || continue

		echo "${csum}  ${file}" | sha256sum -sc - || echo "$file"
	done
}

add_uci_conffiles() {
	local file="$1"
	( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
		/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
		-type f -o -type l 2>/dev/null;
	  list_changed_conffiles ) | sort -u > "$file"
	return 0
}

add_overlayfiles() {
	local file="$1"
	if [ -d /overlay/upper ]; then
		local overlaydir="/overlay/upper"
	else
		local overlaydir="/overlay"
	fi
	find $overlaydir/etc/ -type f -o -type l | sed \
		-e 's,^/overlay\/upper/,/,' \
		-e 's,^/overlay/,/,' \
		-e '\,/META_[a-zA-Z0-9]*$,d' \
		-e '\,/functions.sh$,d' \
		-e '\,/[^/]*-opkg$,d' \
	> "$file"
	return 0
}

# hooks
sysupgrade_image_check="fwtool_check_image platform_check_image"
sysupgrade_pre_upgrade="fwtool_pre_upgrade"
[ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
	sysupgrade_init_conffiles="add_uci_conffiles" || \
	sysupgrade_init_conffiles="add_overlayfiles"

include /lib/upgrade

[ "$1" = "nand" ] && nand_upgrade_stage2 $@

do_save_conffiles() {
	local conf_tar="${1:-$CONF_TAR}"

	[ -z "$(rootfs_type)" ] && {
		echo "Cannot save config while running from ramdisk."
		ask_bool 0 "Abort" && exit
		return 0
	}
	run_hooks "$CONFFILES" $sysupgrade_init_conffiles
	ask_bool 0 "Edit config file list" && vi "$CONFFILES"

	v "Saving config files..."
	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
	tar c${TAR_V}zf "$conf_tar" -T "$CONFFILES" 2>/dev/null

	rm -f "$CONFFILES"
}

if [ $CONF_BACKUP_LIST -eq 1 ]; then
	add_uci_conffiles "$CONFFILES"
	cat "$CONFFILES"
	rm -f "$CONFFILES"
	exit 0
fi

if [ -n "$CONF_BACKUP" ]; then
	do_save_conffiles "$CONF_BACKUP"
	exit $?
fi

if [ -n "$CONF_RESTORE" ]; then
	if [ "$CONF_RESTORE" != "-" ] && [ ! -f "$CONF_RESTORE" ]; then
		echo "Backup archive '$CONF_RESTORE' not found."
		exit 1
	fi

	[ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
	tar -C / -x${TAR_V}zf "$CONF_RESTORE"
	exit $?
fi

type platform_check_image >/dev/null 2>/dev/null || {
	echo "Firmware upgrade is not implemented for this platform."
	exit 1
}

for check in $sysupgrade_image_check; do
	( eval "$check \"\$ARGV\"" ) || {
		if [ $FORCE -eq 1 ]; then
			echo "Image check '$check' failed but --force given - will update anyway!"
			break
		else
			echo "Image check '$check' failed."
			exit 1
		fi
	}
done

if [ -n "$CONF_IMAGE" ]; then
	case "$(get_magic_word $CONF_IMAGE cat)" in
		# .gz files
		1f8b) ;;
		*)
			echo "Invalid config file. Please use only .tar.gz files"
			exit 1
		;;
	esac
	get_image "$CONF_IMAGE" "cat" > "$CONF_TAR"
	export SAVE_CONFIG=1
elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then
	[ $TEST -eq 1 ] || do_save_conffiles
	export SAVE_CONFIG=1
else
	export SAVE_CONFIG=0
fi

if [ $TEST -eq 1 ]; then
	exit 0
fi

run_hooks "" $sysupgrade_pre_upgrade

# Some platforms/devices may want different sysupgrade process, e.g. without
# killing processes yet or calling ubus system upgrade method.
# This is needed e.g. on NAND devices where we just want to trigger stage1 at
# this point.
if type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
	platform_pre_upgrade "$ARGV"
fi

ubus call system upgrade
touch /tmp/sysupgrade

if [ ! -f /tmp/failsafe ] ; then
	kill_remaining TERM
	sleep 3
	kill_remaining KILL
fi

if [ -n "$(rootfs_type)" ]; then
	v "Switching to ramdisk..."
	run_ramfs '. /lib/functions.sh; include /lib/upgrade; do_upgrade'
else
	do_upgrade
fi
